GSM/GPRS module: SIM900 SIMCOM Band: 2G 850/900/1800/1900MHz 1. GPS and location-based services The location service is also known as A-GPS. The tracking device in the subway or tunnel can get the location via AGPS.
GSM/GPRS module: SIM900 SIMCOM Band: 2G 850/900/1800/1900MHz 1. GPS and location-based services The location service is also known as A-GPS. The tracking device in the subway or tunnel can get the location via AGPS.